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UNITED STATES PATENT OFFICE.

J. (J. RUTHERFORD, OF DERBY LINE, VERMONT.

SOLUTION FOR TONING PHOTOGRAPHS.

To all whom it may concern:

Be it known that I, J. 0. RUTHERFORD, of Derby Line, in the county of Orleans and State of Vermont, have invented a new and useful Solution for Toning Photographic Pictures; and I do hereby declare that the following is a full, clear, and exact description of the manner of using and" compounding the same.

To enable those skilled in the art to fully understand my invention, I will proceed to describe the manner of preparing my toning solution and its application to photographic pictures.

The ingredients of the solution are as follows: corrosive sublimate, 3 ij, (two drams;) tartaric acid, f3 xii,(twelve drains Sal-soda, 3 ii, (two drams;) hydrochloric acid, gtt xxx, (thirty drops aqua dist., f xii, (twelve ounces.) This solution, after well mixing, is let stand for forty-eight hours, and after filtering is ready for use.

The manner of applyingthis solution to the rints is as follows: As the print is removed from the printing-board the operator takes it between the thumb and forefinger of each hand, with the face of the picture down, and passes it over the toning-bath. The right hand is then depressed until this end of the print touches the solution. The left hand is then dropped, at the same time carrying the print from left to right, drawing it rapidly over the surface of the solution. The picture is then immediately immersed in acleanwater bath to give ita thorough rinsing. As

a rule, this will be suflicient to tone a picture; but when it is printed down very dark it may be necessary to go through the same manipulation the second time. Care should be taken to have the print well washed before it is put into the fixing-bath. Much of the success of this operation depends upon dexterityofmanipulation, having everything neat and clean, with as fewchemicals about as possible, and in never handlinga new print after handling the fixing-bath until the hands have been washed. The water in which the print has been washed, after coming from the toning-bath, should be changed often, or it would be very aptto discolor the picture.

The advantages in which the use of my tonin g solution possesses over all other known processes are that it greatly cheapens the process of toning pictures; that the toning ofa print with my solution is an instantaneous process,thereby saving a great amount of valuable time; that it gives a sharpness and distinctness to the picture that cannot be obtained by any other known method; that it can be worked in a clear light without injury to the toning solution or the print, and that the colors are permanent.

What I claim, and desire to secure by Letters Patent, is-

The toning solution composed of the withinspecified materials, combined in the manner as and in aboutthe proportions set forth.

J. O. RUTHERFORD.

Witnesses:

Asa WIMBALL, WALTER B. COBB. 

